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Dorot is an organization for helping seniors. It's in New York City. I've added them to the thirty minute category because they have a project where you make a birthday card, send it to them, and they send it to a frail and isolated senior. This could be a great activity to do with kids on a rainy day, or with a youth group etc. Or just make one yourself and send it to them. Why not? A thirty minute break to do something creative is fun and invigorating.

 
For the birds 06/14/2010
 
The Gulf Oil Spill is going to be an area of concern for quite awhile, unfortunately. The American Bird Conservancy is a highly rated organization that can give you the latest information.
 
 
And I found a great site that is informational and gives opportunities for action. This is another four-star site (from Charity Navigator). It's called Oceana. Lots to read on this one.
 
 
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Reader To Reader
Added FreeRice. Not just vocabulary, either!
Added Reader To Reader.
[My day job!]
Added One Brick. Good for those in their twenties and thirties I think.
Added Save The Children's program in Ethiopia. It's interesting to see that they have made the sponsor relationship web-based.